A method for removing heavy metals cadmium, lead and copper in water with Fred's salt

A heavy metal and water technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of low efficiency of chemical flocculants, less than ideal removal, and secondary pollution.

Inactive Publication Date: 2011-12-28
章兴华
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  • Claims
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Problems solved by technology

However, the efficiency of existing chemical flocculants is low, and if used in combination with organic matter, there may be potential secon

Method used

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  • A method for removing heavy metals cadmium, lead and copper in water with Fred's salt
  • A method for removing heavy metals cadmium, lead and copper in water with Fred's salt
  • A method for removing heavy metals cadmium, lead and copper in water with Fred's salt

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Embodiment 1

[0014] Embodiment 1 of the present invention: when adopting a kind of method of the present invention to remove heavy metal cadmium, lead, copper in water body with Fred's salt to process water body, heavy metal Cd in polluted water body 2+ , Pb 2+ 、Cu 2+ The content should be in the order of mg / L, that is, the heavy metal Cd contained in each liter of water 2+ , Pb 2+ 、Cu 2+ The content is not more than 1000mg. During implementation, take an emulsion containing 20% ​​of Fred's salt and add it to the water body at a ratio of solid-to-liquid ratio of 1:10000 to 8:10000. When the pH value in the water body is 6.5 to 7.5, it can be directly Add Fred's salt emulsion; when the pH value of the water body is acidic, it is necessary to add an alkalizing agent to adjust the pH value to 6.5-7.5, and then add Fred's salt emulsion; after hydraulic stirring, the mixed liquid is obtained, and its hydraulic strength Stirring kinetic parameters GT value > 4500 stage is not less than 5min;...

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Abstract

The invention discloses a method for removing heavy metals cadmium, lead and copper in water with Fred's salt. When the content of heavy metals Cd2+, Pb2+ and Cu2+ in water is on the order of mg/L, 20% of Fred's salt is taken The emulsion is added into the water body at a solid-liquid ratio of 1:10000 to 8:10000, and a mixed liquid is obtained after hydraulic stirring, and the mixed liquid is passed through an advection settling tank or an expansion upflow settling tank to collect heavy metal-containing sediments, and Collect clean water by way of water discharge along the way. The invention not only has the advantages of good water treatment effect, simple process and low cost, but also has the advantages of no secondary pollution, suitable for large-scale treatment of heavy metal-containing wastewater, and the like.

Description

technical field [0001] The invention relates to a method for removing heavy metals cadmium, lead and copper in water by using Friedel's salt, and belongs to the technical field of heavy metal water treatment. Background technique [0002] At present, according to the recommendation of "Urban Sewage Treatment and Pollution Prevention Technology Policy", the process technologies used for decarbonization, dephosphorization and denitrification of urban sewage mainly include A / O, AA / O, SBR and their improved processes; oxidation ditch and its Improved craftsmanship. The common feature of these technologies is that they are economical to operate, and have good decarburization, dephosphorization, and denitrification effects. Although these existing technologies have a certain ability to remove heavy metal ions, they have no control over the concentration of heavy metal ions in sewage. means. Therefore, in order to control the discharge concentration of heavy metal ions in treated...

Claims

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Application Information

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IPC IPC(8): C02F1/62
Inventor 章兴华周丽芸
Owner 章兴华
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